JPH07103533B2 - Asphalt plant dryer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dryer that is an aggregate heating device for an asphalt plant that manufactures an asphalt mixture that is a road paving material, and particularly to both a new aggregate and an asphalt paving waste material. The material also relates to a dryer that can be heated.

[Prior Art] Waste asphalt pavement material (hereinafter referred to as “waste material”) dug up by road construction and the like is being regenerated by heating and reused as an asphalt mixture material. As described in Japanese Patent Laid-Open No. 1-315502, while partitioning the central portion of the drum with a partition plate, a cylindrical body that diverts and passes hot air is inserted into the front half of the drum on the burner side, and the tip portion thereof is the partition plate. There is proposed a dryer in which the first half of the drum is used for heating a new aggregate and the second half of the drum is used for heating a waste material.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional dryer in which a cylindrical body for diverting and passing hot air is inserted in the front half of the drum, when the new aggregate is heated in the front half of the drum, the inside of the drum is aggregated. Has a drawback that the tubular body is apt to be damaged due to wear during the rolling down, because the tubular body falls onto and collides with the tubular body for hot air distribution inserted in the drum.

In view of the above points, the present invention makes it possible to heat new material in the front half of the drum and heat waste material in the rear half of the drum, and the hot air distribution passage for sending hot air from the front half of the drum to the rear half of the drum is made of aggregate. It is an object of the present invention to provide an asphalt plant dryer having a structure that does not cause damage due to wear.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a hot hopper having an aggregate heating burner at one end of an external drum that is rotatably tilted and pivoted, and exhaust at the other end. A cold hopper having a flue is arranged, an inner drum having scraping blades is inserted and fixed in the front half of the outer drum near the burner, and a substantially umbrella-like shape is provided at the burner side end of the inner drum. While arranging the hot air distribution fluid, the other end of the inner drum is closed and a new material supply passage is formed in the side portion in a direction perpendicular to the drum axis to penetrate the outer drum wall and Waste material discharge holes are formed at appropriate intervals along the peripheral wall of the external drum located on the cold hopper side of the supply passage, and the waste material discharge hole and the new material supply passage are surrounded by a cover body from the outer peripheral portion to supply the new material. A new material supply shoe is placed on the top of the cover facing the passage. A new material discharge port at the bottom of the hot hopper, a waste material supply section at the cold hopper, and a waste material discharge section having a discharge gate at the bottom of the cover body facing the waste material discharge hole. (EN) A dryer for an asphalt plant characterized in that one end of a bypass exhaust flue is attached to a body and the other end is connected to an exhaust flue arranged in a cold hopper.

[Operation] According to the dryer of the asphalt plant according to the present invention, when the new material and the waste material are heated at the same time, the discharge gate at the lower part of the cover body is opened and the bone disposed at one end of the external drum is opened. The high-temperature hot air generated by the burner for material heating is sent into the external drum, introduced into the internal drum inside the external drum, and passed therethrough, to the bypass exhaust passage connected to the cover body via the new material supply passage downstream. On the other hand, a part of the hot air diverted by the hot air splitting fluid arranged on the upstream side of the internal drum passes through the outside of the internal drum and is sent to the latter half of the external drum and is connected to the cold hopper at the end of the external drum. Derived from the exhaust flue.

Then, the new material is supplied from the new material supply chute at the top of the cover body, introduced into the inner drum through the new material supply passage formed by penetrating the outer drum wall, and rolls inside the drum while being picked up by the raising blades. It is made to flow down, transferred to the first half of the external drum, and while being transferred to the hot hopper, heat is exchanged with hot air to heat it to a desired temperature, and it is discharged from a new material discharge port under the hot hopper.

Further, the waste material is supplied from the cold hopper side into the external drum, and while it is rolling down in the latter half of the external drum, it is desired by the hot air guided to the latter half of the external drum through the gap between the outer drum and the inner drum. The temperature is raised to the above temperature, and the material is dropped from a waste material discharge hole formed in the approximate center of the external drum and discharged from the waste material discharge portion.

Further, when heating only the new material, first, the discharge gate at the bottom of the cover body is closed to prevent the material from flowing out of the waste material discharge portion, and a damper for adjusting the air flow rate of the bypass exhaust flue. To prevent hot air from flowing to the bypass exhaust flue side. Then, new material is supplied from the cold hopper side into the external drum, heated in the latter half of the external drum and dropped from the waste material discharge hole drilled in the center of the external drum, and a part of the new material is placed under the cover body. While being collected in the waste material discharge part of, the feed blade attached to the outer peripheral wall of the external drum laterally feeds the inside of the cover toward the burner side, scoops up this new material and transfers it into the internal drum through the new material supply passage, The inside is tumbled down, further transferred to the front half of the external drum and transferred to the hot hopper to exchange heat with hot air to heat to a desired temperature, and is discharged from a new material discharge port under the hot hopper.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a dryer for heating a new material and a waste material, and a cylindrical outer drum 3 in which a large number of scraping blades 2 are provided inside.
Is rotatably and tiltably supported by a support roller 5 on the machine base 4, and is rotated at a predetermined speed by a driving device (not shown). Reference numeral 6 denotes a hot hopper disposed at one end of the external drum 3. The hot hopper 6 is provided with an aggregate heating burner 7 for sending hot air into the external drum 3, and below the hot hopper 6. A new material discharge port 8 for discharging the heated new material is formed.

Reference numeral 9 denotes a cold hopper disposed at the other end of the external drum 3, and an exhaust flue 10 for deriving hot air sent into the external drum 3 is disposed above the cold hopper 9 and a lower portion. A waste material supply section 11 is formed in the.

An inner drum 13 around which a large number of scraping blades 12 are provided is inserted and fixed in the front half portion of the outer drum 3 near the burner 7, and the hot air sent from the burner 7 to the burner 7 side of the inner drum 13. A substantially umbrella-shaped hot-air splitting fluid 14 for diverting is fixed by a fitting 15. The hot air split fluid 14 is arranged to adjust the amount of hot air to be introduced into the internal drum 13 and the amount of hot air to be passed through the outside of the internal drum 13 to be introduced into the latter half of the external drum, and the shape and size are appropriately set. It may be designed, or may be omitted if the air volume can be adjusted by an air volume adjusting damper arranged in the downstream flue.

The end portion of the inner drum 13 on the cold hopper 9 side is closed, and a new material supply passage 16 is formed on the side portion at a direction perpendicular to the drum axis to allow the wall of the outer drum 3 to penetrate therethrough. A guide chute 17 for guiding the new material to the new material supply passage 16 is formed at the tip portion.

Reference numeral 18 denotes a waste material discharge hole for discharging the material flowing down the latter half of the external drum 3 from the external drum 3, and the waste material discharge hole 18 is a peripheral wall of the external drum 3 located on the cold hopper 9 side of the new material supply passage 16. The holes are provided at appropriate intervals.

A cover body 19 is disposed so as to cover the waste material discharge hole 18 and the new material supply passage 16 from the outer peripheral portion, and a new material supply chute is provided above the cover body 19 so as to face the new material supply passage 16. Twenty are arranged. In addition, a waste material discharge hole 18 is provided below the cover body 19.
A waste material discharge portion 21 is formed so as to face the above. Waste material discharge section
The discharge gate 22 is arranged in the discharge gate 21.
The material that has flowed down the latter half of the external drum 3 can be dropped from the waste material discharge hole 18 and discharged to the outside by opening. Further, if the discharge gate 22 is closed, a part of the material flowing down the latter half of the external drum 3 is collected in the waste material discharge portion 21, and the inside of the cover body 19 is moved by the feed blades 23 arranged on the outer peripheral portion of the external drum 3. The material can be laterally fed toward the burner 7 side, scooped up by a preliminary chute 17 at the tip of the new material supply passage 16 and transferred to the internal drum 13 through the new material supply passage 16.

Reference numeral 24 denotes a hot-air guide body having a substantially trumpet shape in which one end is substantially equal to the inner diameter of the outer drum 3 and the other end is tapered.
The hot air that has passed through the gap between the outer drum 3 and the inner drum 13 is guided to the vicinity of the center of the drum.
The second half is arranged to improve heat exchange with the material flowing down. Further, the hot air guide body 24 also plays a role of blocking the material flowing down the latter half of the external drum 3, and all of the material flowing down can be dropped from the waste material discharge hole 18.

Reference numeral 25 denotes a bypass flue connected to the cover body 19, which joins the exhaust flue 10 connected to the cold hopper 9 and guides the hot air passing through the inside drum 13 to the exhaust flue 10.
Reference numerals 26, 27, and 28 are air flow rate adjusting dampers disposed in the flue gas, and are appropriately controlled in opening degree.

Reference numeral 29 denotes a new material supply conveyor in which the tip of the new material supply chute 20 is exposed, and the new material discharged from a new material storage hopper (not shown) that stores the new material for each particle size is supplied to the internal dryer 13 Is to be supplied to. Reference numeral 30 denotes a waste material supply conveyor having its tip facing the waste material supply section 11 of the cold hopper 9, and the waste material discharged from a waste material storage hopper (not shown) for storing the waste material according to various particle sizes is supplied to the external dryer 3. To supply.

When heating the new aggregate and the waste material at the same time, the discharge gate 22 under the cover body 19 is opened, and the damper 26 is positioned at the solid line position shown in FIG.
While sending hot air to the outer drum 3 and guiding it into the inner drum 13, the new material cut out from the new material storage hopper is supplied to the new material supply chute 18 formed on the cover body 19 via the new material supply conveyor 29, The new material is received by the guide chute 17 and introduced into the internal drum 13 from the new material supply passage 16, and the new material is heated while rolling up and down in the internal drum 13 while scraping the new material by the scraping blade 12. And the internal drum 13
The new material that has reached the end of is dropped onto the external drum 3 and is further heated while rolling up the front half of the external dryer 3 while being scratched by the scraping blades 2 to raise the temperature to a desired temperature,
The material is discharged from the new material discharge port 8 below the hot hopper 6.

Further, the waste material cut out from the waste material storage hopper is supplied from the waste material supply unit 11 of the cold hopper 9 into the external drum 3 via the waste material supply conveyor 30, and is tumbled while being scraped up by the scraping blades 2 and the external drum 3 The waste material is heated to a desired temperature by contacting it with the hot air guided to the latter half of the outer drum 3 through the gap between the inner drum 13 and the inner drum 13, and the waste material discharge hole 18 formed in the center of the outer drum 3 Then, it is discharged from the waste material discharge section 21.

Further, when only the new material is heated, the discharge gate 22 below the waste material discharging section 21 is closed to prevent the material from flowing out of the waste material discharging section 21, and the damper 26 is arranged as shown in FIG. Bypass exhaust flue 25 at the position shown by the dotted line
Keep hot air from flowing into. Burner 7 at this time
The hot air blown into the internal drum 13 passes through the internal drum 13 and is led out from the new material supply passage 16, and further the waste material discharge hole
It passes through 18 and is guided to the latter half of the external drum 3. Then, the new material cut out from the new material storage hopper is supplied from the waste material supply unit 11 of the cold hopper 9. The supplied new material rolls down while heating the latter half of the external drum 3, falls from the waste material discharge hole 18 of the external drum 3 to the waste material discharge portion 21, and collects a part of the aggregate in the waste material discharge portion 21. Meanwhile, the feed blade 23 laterally feeds the inside of the cover body 19 toward the burner 7, and the guide chute 17 at the tip of the new material supply passage 16 scoops up the new material from the new material supply passage 16 into the internal drum 13. Transfer to the inner drum 13 for rolling down, and then the outer drum 3
It is made to fall to the first half part of and moved toward the hot hopper 6. In this way, the new material is brought into contact with hot air and heated to a desired temperature while moving the latter half of the outer drum 3, the inner drum 13 and the first half of the outer drum 3, and the new material discharge port 8 below the hot hopper 6 is provided. Eject more.

In addition, the temperature control of new material and waste material
It goes without saying that control is performed by the opening degree of the air volume adjusting dampers 27, 28 and the supply amount of each material.

[Effects of the Invention] As described above, in the asphalt plant dryer according to the present invention, both the new material and the waste material can be simultaneously heated with a single drum, or the respective materials can be heated independently. You can also do it.

The hot air for heating the waste material passes through the outside of the internal drum for heating the new material inserted in the front half of the drum and is guided to the latter half of the drum for heating the waste material. Since a tubular body for diversion is not required, the hot air diversion passage is not damaged by the aggregate.

Further, since the device can be made compact, the structure and arrangement of the device can be simplified and the space can be saved.

[Brief description of drawings]

1 is a partially cutaway schematic front view showing an embodiment of a dryer for an asphalt plant according to the present invention, FIG. 2 is an enlarged sectional view taken along the line AA of FIG. 1, and FIG. 3 is FIG. BB
It is an expanded sectional view of a line. 1 ... Dryer, 3 ... External drum, 6 ... Hot hopper, 7
… Burner, 8… New material discharge part, 9… Cold hopper, 10…
Exhaust flue, 11 ... Waste material supply part, 13 ... Internal drum, 14 ... Hot air distribution fluid, 16 ... New material supply passageway, 19 ... Cover body, 18 ... Waste material discharge hole, 20 ... New material supply chute, 22 ... Discharge gate , 21 ... Waste material discharge part, 25 ... Bypass flue, 24 ... Hot air guide

Claims (1)

[Claims] 1. A hot hopper having an aggregate heating burner at one end of a rotatable rotatably tilted outer drum, and a cold hopper having an exhaust flue at the other end thereof. An inner drum having scooping blades is inserted and fixed in the front half part near the burner, and a substantially umbrella-shaped hot air split fluid is arranged at the burner side end part of the inner drum, while the other end part of the inner drum is arranged. Is closed and a new material supply passage is formed in the side portion in a direction perpendicular to the drum axis to penetrate the outer drum wall, and along the peripheral wall of the external drum located on the cold hopper side of the new material supply passage. By forming a waste material discharge hole at an appropriate interval, the waste material discharge hole and the new material supply passage are surrounded by a cover body from the outer peripheral portion, and a new material supply chute is provided on the upper part of the cover body facing the new material supply passage, A new material discharge port is formed at the bottom of the hot hopper, and A waste material supply part is formed in the field hopper, and a waste material discharge part having a discharge gate is formed below the cover body facing the waste material discharge hole. Furthermore, one end of the bypass exhaust flue is attached to the cover body and the other end is cold. An asphalt plant dryer characterized by being connected to an exhaust flue provided in a hopper.